paper



3 Sheets-Sheet 1.

(No Model.)

Patented Feb. 15, 1887.

IlI/IIIlII/llI/IlI/II/lI/II N4 PETERS, Phnmuchogm hm, Wmhmglon. D. C.

3 Sheets-Sheet 2'.

(No Model.)

ENGINE FOR GUTTING OB, HEATING, &c., PAPER. STUFF. No. 357,998.

Patented Feb. 15', 1887 N. PETERS, PhnkwLilhogmpher. Washinginll. D Q

3 Sheen's-sheet 3.

(No Model Patented Feb 15, 1887.

wzfnemes:

N. PETKRS. Pl\nlu-1Jlhngmpher. Washin ton. D. c.

UNITED STATES PATENT OFFICE.

RUDOLF KRON, OF UNTERSTRASS, NEAR ZURICH, SVITZERLAND.

ENGENE FOR CUTTING OR BEATING, 800., PAPER-STUFF.

SPECIFICATION forming part of Letters Patent No. 357,998, dated February 15, 1887.

Application filed August 3, 1886. Serial No. 209,837.

To aZZ whom it may concern:

Be it known that I, RUDoLn KRON, a citizen of the Republic of Switzerland, residing at Unterstrass, near Zurich, in Switzerland, have invented certain new and useful Improvements in Engines for Guttin g or Beating, Mixing, Sizing, and Dyeing Paper-Stuff, of which the following is a specification.

Figure 1 is a vertical sectional view of my improved grinding and mixing machine for the manufacture and treatment of paper-stock. Fig. 2 is a top plan View showing one-half in horizontal section, the section being taken on line M N, Fig. 1. Figs. 3 and 4; are vertical sectional views of modifications of the machine having two rollers, and Fig. 5 is a similar view of still another modification.

Similar letters of reference indicate corresponding parts in all the figures.

My invention has relation to machines for grinding and mixing paper-stock; and it consists in the improved construction and combination of parts of such a machine, in which the stuff is conveyed and mixed by means of suitable conveyers, independent of the grinding-roller, as hereinafter more fully described and claimed.

In machines for grinding and mixing paper-stock the stuff is generally carried around in the trough and mixed and circulated by the revolution of the grinding-roller, but in this new improvement the circulation of the stuff and the mixing of the same is accon1- plished independent of the grinding-roller, which will especially adapt the machine to be used in the grinding and mixing of paperstock in which a number of different elements and substitutes are used, so that the hard and tough fiber stuff may first be ground, whereupon the tendererfiber stufi may be used, and at last the different elements which add to the weight and gloss of the paper be added, the machine being capable of having a larger or smaller proportion of the entire stuff passed through the grinder or of having the grinding mechanism entirely stopped, the mixing taking place independent of the grinding and in connection with the circulation of the stuff in the trough.

While in the usual washing and beating ma- (No model.)

chines it is the grindingroller which has to perform the grinding, the mixing, and the circulation of the stuff in the trough, in this new improvement the mixing and circulating of the stuff is accomplished by suitable propellers, which thus divide the work with the grinding-roller, thus increasing the capacity of the machine and enabling the grinding roller to be composed of a simple serrated roller, as well as of a roller provided with radiating knife'blades, while in the former machines of this class it has been necessary to have the roller provided with knife-blades with sufficient space between them to allow the knives to mix the stuff, and which blades would require occasional sharpening, in this construction the work required from the grinding-roller is not so severe as in the other machines, wherefore the wear upon the grindingsurfaces will not be so great, allowing the r011 ers to be either serrated or to be providedwith knives which will not require frequent sharpening.

In the accompanying drawings, the letter A indicates the trough, which is separate from the trough portion in which the grindingroller is journaled, and which is provided with an inclined bottom in the channel a, which passes from the grinding-roller toward the end of the trough, which is formed with divergingly-curving end walls preferably segmental in shape. The sides of this central channel are inclosed by partitions a, the outer ends of which are at the centers of the segmental end walls, and outside of these partitions are formed channels a", the ends of which are continued through contracting channels a into a cylindrical chamber, 0, below the trough portion in which the grinding-roller B is journaledc This grindingroller is j ournaled in suitable bearings in the end of the trough, and is provided with a pulley, R", at one end of its shaft, and the lower portion of the roller operates opposite to a concave breast, B, above the cylindrical chamber, and provided with suitable serrations or cutting-knives similar to the serrations orknives of the roller.

Propellers b revolve in the ends of the cylindrical chamber at the entrances of the contracting channels, and serve to mix and force the stuff up through a channel, D, leading up forward of the grinding-roller and its breast, and the upper portion of the grinding-roller is covered by a semi-cylindrical shield or cap, 6, leaving a small gate-aperture, d, between its lower edge and the upper edge of the breast at the forward side of the roller, which aperture is closed and governed by means of a gate, d, sliding over it, and having suitable means for operating it.

The propeller-shaft is provided with a pulley, R, at one end for conveying motion to it, and the top of the trough being open suit able washing-cylinders W may be journaled across the open top of the trough.

IVhen the stock and the water have been filled into the machine, the revolving grinding-roller will grind the fibrous elements of the stuff and carry them out into the central channel, from which they will flow to both sides around the ends of the partitions into the side channels, from which the stuff will be conveyed into the cylindrical chamber, from which the propellers will again carry the stuff up to the grinding-cylinder, the stuff being either carried entirely over the said cylinder or roller over the semi-cylindrical shield, or partly over the shield and partly under the cylinder, or entirely under the cylinder. This may be accomplished by either closing the gate entirely, leaving it partly open, or opening it entirely, and at the same time slackening the speed of the propellers, so that the stuff will not be forced upward faster than the gate can admit it and the grinding-roller can operate on it. The propellers will in this manner mix the elements of the stuff and circulate the stuff in the trough, and the degree to which the stuff may be operated on by the grindingroller, which has nothing else to do besides the grinding, may he graduated by the opening or closing of the gate.

As the propellers in this construction do the mixing and circulating of the stuff, it is not necessary to have the spaces across the grinding-roller between the rows of knives, as in the formerly-used machines, as the said spaces had the function in the former machines to serve as receptacles for the stuff which would be forced by the adjoining row of knives, so that these spaces may be dispensed with, and the roller, if desired, be simply serrated, instead of being provided with rows of knives.

In Fig. 3 the breast is dispensed with and another roller, 13, substituted, being placed parallel to the grinding-roller in a horizontal plane with the same, and, in place of the breast, covering the lower and forward portion of the roller and closing the trough there. A cylindrical shield, f, is carried around the roller parallel with its face and formed with an upwardly-projecting lip, f, near its lower end, projecting toward the under side of the roller, preventing any stuff from being carried around upon the roller. The gate-apertureis between the edges of the cylindrical shields covering the two rollers, and the gate covers the aperture in such a manner that more or less of the aperture may be covered. The stuff passing over the shield covering the forward roller will enter the gate when the latter is open and pass down between the two rollers,which will grind the fibrous elements of the stuff, and when the gate is entirely closed the stuff will be carried over both the shields in the same manner as over the one shield in the first-described construction.

In Fig. at the rollers are placed one above the other, and the lower roller is provided with the shield having the lip, which shield will convey the stuff to the space between the rollers, which is the only place at which there is a passage for the stuff, this construction being without the gate and only admitting of the stuff being carried between the grinding-rollers.

In Fig. 5 the breast is only placed at the under side of the roller, without covering the lower forward portion of its surface; but a concave, g, is formed at the rear portion of the under side, up along which concave the stuff is beaten by the cutters, this form having no gate or shield. A gate, n, operated by means of ahandle, m, and suitable levers and rods, is placed at the lower side of the cylindrical chamherin this construction, and covers the outlet-channel 0, through which the contents of the trough may be emptied. In this latter construction the circulating of the stuff is partly accomplished by the grinding-roller, being in this respect somewhat similar to the formerlyused construction.

It will be seen that in all the several con structions shown and described the stuff will be mixed and circulated, the grinding only being allowed to the grinding-roller.

Having thus described my invention, Iclaim and desire to secure by Letters Patent of the United States 1. In a machine for grinding and mixing paper-stock, the combination of a channel to the rear of the grinding-roller having diverging rear ends, forwardly-extending channels extendingfrom the curved diverging ends, and having contracting forward ends, aeylindrical chamber having propellers within it, and an upwardlyextending channel extending forward of the grinding-roller, as and for the purpose shown and set forth.

2. In a machine for grinding and mixing paper-stock, the combination of atrough having side channels having their forward ends entering a chamber under the grinding-roller, revolving propellers within the inlets to the said chamber, and an upwardly-curved channel extending from the cylindrical chamberto the grinding-roller, as and for the purpose shown and set forth.

3. In a machine for grinding and mixing paper-stock, the combination, with a grindingroller, of a trough having means for carrying the stuff upward forward of the said roller,

and a shield covering the upper forward portion of the grinding-roller, allowing a portion of the stuff to pass above the roller, as and for the purpose shown and set forth.

4. In a machine for grinding and mixing paper-stock, the combination,witha grindingroller, of a channel curved upward to the forward side of the said roller, and having means for forcing the stuff upward, a shield covering the upper portion of the roller and forming a gate at its lower forward edge to the roller, and a sliding gate for partly or entirely closing the said gate-aperture, as and for the purpose shown and set forth.

5. In a machine for grinding and mixing paper-stock, the combination of a trough having a rearwardly-inclined central channel and diverging semicircular rear walls, and formed with partitions at the sides of the said channel, extending to the centers of the said walls, forming forwardly-inclined channels having contracting forward ends, a cylindrical chamber at the ends of the side channels connecting the same,propellers in the entrances to the said chamber, a grindingroller journaled in the forward portion of the trough above the cylindrical chamber, a concave breast around the lower forward side of the roller, forming an upwardly-curved channel from the cylindrical chamber to the grinding-roller, a semi-cylindrical shield covering the upper half of the RUDOLF KRON.

Witnesses EMIL BLUM, WILLIAM SCHNEIDER. 

